Numerical Simulation of Seepage-Heat-Solid Coupling of Gas Seepage in Prepumped Boreholes under Electrothermal High Temperature Field

Figure 3

Damage effect of coal body under different heating temperatures.

(a) Damage effect at heating temperature of 200°C

(b) Damage effect at heating temperature of 400°C

(c) Damage effect at heating temperature of 600°C

(d) Damage effect at heating temperature of 800°C